Idaho /

Winchester Lake

Lake in Idaho · 105 acres · near Winchester

Winchester Lake has 1 boat ramp listed as public.

Algal bloom health advisory

Idaho Department of Health and Welfare has a cyanobacteria health advisory for this water (updated October 7, 2026). Avoid contact with discoloured water or scum, and keep pets and children out of it.

Idaho Department of Health and Welfare · checked October 18, 2026

Past algal blooms

Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2019, 2020, 2025 and 2026.

state reports compiled by U.S. EPA · checked October 18, 2026

Launches